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Business Combinations (Aggregate Fair Value) (Details) - Propane and related equipment sales [Member] - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Working capital   $ (249)  
Working capital $ 139   $ 233
Customer tanks, buildings, land, salt water disposal wells, and other 1,220 3,625 236
Aggregate fair value of transactions 4,395 6,602 7,731
Ferrellgas, L.P. [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Working capital   (249)  
Working capital 139   233
Customer tanks, buildings, land, salt water disposal wells, and other 1,220 3,625 236
Aggregate fair value of transactions 4,395 6,602 7,731
Customer Lists [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Finite-lived Intangible Assets Acquired 2,648 2,962 6,569
Customer Lists [Member] | Ferrellgas, L.P. [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Finite-lived Intangible Assets Acquired 2,648 2,962 6,569
Non-Compete Agreements [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Finite-lived Intangible Assets Acquired 388 264 693
Non-Compete Agreements [Member] | Ferrellgas, L.P. [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Finite-lived Intangible Assets Acquired $ 388 $ 264 $ 693